This week the bigger fan leaves has started to yellow and get dark spots on some. I turned the second light a week ago and I'm thinking about some burning or some type of deficiency but I have been using my nutrient schedule for a while now and the dont show deficiency. I turned the potency of the bigger light to 50% dimmed like 3 days ago, plus I double the dose of nutrients this week to see how they respond. Let me know what you think this yellowing and spots are.
@GuerrillaNo_4, I look at your diary and by the looks you may have some stress heat or broad mites, stress heat is an easy fix but them mites are no joke, hope you can fix it bro.
@Lou_Grows, You're right. It was heat stress, I was pushing the plants as much as I could with a high light DLI and Co2, got very good fast growth around 28/29'C but started seeing stress up around 31/32'C so had to dial it back to 28/29'C.
I run a perpetual grow, the younger plants loved the higher temps but late flower ones didn't handle it well. In the end I've found that 27/28'C with 50-55% RH and Co2 is the best compromise for all the plants at different stages.